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Dec. 15, 1959 BECKER Re. 24,754

SEALS FOR GYRATORY CRUSHER SHAFTS Original Filed May 14, 1957 2Sheets-Sheet 1 3a A9 7a 40 7 24 .5 wk 1 v 77 {0 I am \\Y 6 7 5 fiveifzar George ,2 Bee/fer 'y Jar Yer a? Carrier SEALS FOR GYRATORY CRUSHERSHAFTS George D. Becker, Wauwatosa, Wis., assignor to NordbergManufacturing Company, Milwaukee, Wis., a corporation of WisconsinOriginal No. 2,878,082, dated March 17, 1959, Serial No. 659,134. May14, 1957. Application for reissue July 24, 1959, Serial No. 829,478

9 Claims. (Cl. 308142) Matterenclosed in heavy brackets appears inthe 1. original patent but forms no part of this reissue specification;matter printed in italics indicates the additions made by reissue.

- My invention relates to an improvement in supporting means for thecrushing head of a gyratory crusher, and

. has for one purpose to provide an improved oil seal for the upper orsuspended end of a gyratory crusher shaft.

to provide such a seal of maximum simplicity of structure coupled withefficiency of operation.

Another purpose is to provide such a seal in which any pumping orbuilding up of oil pressures is avoided.

Other purposes will appear from time to time in the course of thespecification and claims.

I illustrate my invention more or less diagrammatically in theaccompanying drawings, wherein:.

Figure l is-a vertical axial section through a complete gyratory;

Figure 2 is .a partial vertical axial section, on a considerably largerscale; and

I Figure 3 is a partial vertical axial section of a seal, on a stilllarger scale.

Like parts are indicated by like symbols throughout the specificationand drawings.

Referring to the drawings, 1 generally indicates any suitable supportingbase upon which a main frame structure 2 is mounted. The structure 2 mayinclude an outer circumferential frame member 3, horizontally extendingUnited States, Patent Re. 24,754 Reissued Dec. 15, 1959 tending portion22 extending upwardly through the minimum diameter bore 17 and into theupper larger diameter bore 18.

23 is a shaft suspension sleeve, suitably secured to the upper end ofthe shaft portion 22 and extending outwardly above the ledge or shelfportion 19a. 24 is a suspension ring mounted on the shelf portion 19aand secured in position, for example, by suitable positioning pins 25which are held in suitable apertures in the ledge 19 and extend intoappropriate and somewhat larger cylindrical apertures 26 in thesuspension ring 24. 28 is a suitable spider bushing, resting on theshelf portion 19. It will be understood that suflicient clearance isprovided at 17 to permit the shaft portion 22 to tilt slightly about itsfulcrum or point of gyration X. As will be clear from Figure 2, theshaft suspension sleeve 23 surrounds and engages the crusher shaft 20.As the crusher shaft 20 gyrates about its point of gyration X thesuspension sleeve 23 moves with it. In Figure 2 the lower surface of thesuspension sleeve 23 is tilted upwardly away from the upper surface ofthe suspension ring 24. It will be understood, of course, that at otherpositions of the shaft the lower surface of the suspension sleeve abutsthe upper surface of the suspension ring and the cylindrical outersurface of the suspension sleeve may also abut the opposed inner surfaceof the spider bushing 28. In other .words, as the shaft 20 gyrates, anarea of contact between'the suspension sleeve23 and the suspension ring24 moves circumferentially about the ring 24. Figure 2 is to be taken asdiagrammatic rather than as a working drawing, as the clearances havebeen indicated rather than accurately represented. The parts are soformed and proportioned as to permit such a slight gyration to takeplace, which, of course, is necessary, since the crushing action isimparted to the head by rotating the drive shaft 7 and the eccentricallyapertured sleeve 11. This rotation moves the lower end or portion 21 ofthe crusher shaft .ina generally circular path, to approach a suitablecrushing head 29 and its mantle 30 to the opposed bowl 12' and the bowlliners 13. A problem solved by the present structure is the provision ofadequate oil sealing connecting webs 4, a central fixed bearing hub 5,and-a bearing assembly or sleeve 6 in which a suitable drive shaft 7 ispositioned. This drive shaft may be driven by any suitable pulley 8, bybelts or the like, from a source of power not herein shown.

The shaft isshown as having an inner pinion 9 in mesh with a bevel gear10 connected to and driving an eccentrically. apertured sleeve 11 insaid hub. 12 indicates an upwardly and outwardly extending frame portionor bowl in which any suitable liner or. liners 13 are positioned. 14

is a top spider assembly which may be centered in and secured to thebowl .12, as by bolts 15. The spider assembly supports an inner hub 16,having a bore 17 of lesser diameter, and an upward extension of suchbore 18 of a reduced portion 21 of which extends into the eccentricaperture of the sleeve 6. The shaft has an upwardly exmeans for thespider of the gyratory crusher.

Considering, specifically, the sealing means employed, I show an oilseal retainer ring 31 which rests slidably upon the upper surface of thehorizontal shelf portion 19a. The suspension ring 24, upon which thesuspension sleeve 23 of the crusher shaft assembly rests, is providedwith a circumferential inner, lower recess 32. This recesshas an upperhorizontal face 32a, an inner cylindrical face 32b, and a connectingfillet 320. The oil seal retainer ring 31 is received snugly in therecess. The oil seal retainer ring 31, in turn, has an innercircumferential channel 35 in its inner cylindrical wall, in which ispositioned an O-ring 36. The O-ring is under compression between theinner wall of the channel and the opposite outer wall of the crushershaft portion 22. The parts are so proportioned that, at all times, theO-ring 36 is under pressure and efliciently operates as a sealing memberto prevent any undesired escape or flow of lubricant downwardly alongthe outer surface of the crusher shaft. The oil seal retainer ring 31has in its lower surface anadditional circumferential recess 37 whichhouses a second O-ring 38. It will be noted that the opposite walls orsurfaces of the recess or channel 37 incline toward each other and areso shaped and proportioned that they will prevent the escape or loss ofthe O-ring 38, even when the sealing assembly is lifted upward from theshelf or ledge 19a. In order to prevent any oil pumping action I providea system of channels or vents or'grooves in the various nut 46.

a sufiicient distance to communicate with a radial groove 41. Internalradial passages are also indicated, as at 43 in the suspension ring 24.A circumferential outer groove, as at $4, in the suspension ring,connects with a vertical extension passage, 45. Thus, any tendency'forbuilding up of pressures or pumping of oil is prevented, it beingunderstood that any suitable arrangement or combination of grooves andvents maybe employed. Those herein shown have turned out to bepractical.

It will be realized that, whereas, I have described and v illustrated apractical and operative device, nevertheless --many changes may be madein the size, shape, number and disposition of parts withoutdepartingfrom the spirit of my invention. 1 therefore wish my description anddrawings to be taken as in a broad sense'illustrative or diagrammatic,rather than as limiting me to my precise showing.

The use and operation of my invention are as follows: I show herein agyrato-ry crusher which consistsof an outer circumferentially extendingbowl shown, for example, at 12, and a gyrated conic head, shown, forestample, at 29. This head is mechanically gyrated or rolled againstrock or ore which is fed downwardly from above into the crushing cavitydefined by the head and bowl.

As the eccentric 11 is rotated by the rotation of the shaft 7 the headis gyrated and opposes, in succession, a zone of nip or close approach,whichmoves around the crushing cavity.

The shaft assembly, including the conic head, is suspended in the abovedescribed spider hearing. The susthe upper end of the crusher shaft maypass, and a genorally horizontal ledge formed in said aperture, theshaft having a suspension sleeve at its-upper end, supporting andsealing means for said shaft and head including a suspension ring insaid aperture, having a lower surface engaging said ledge and an uppersurface formed and positioned to receive the opposed lower surface ofthe pension is actually obtained by the employment of a flat supportingwasher or suspension ring 24, which rests on the ledge 19a and whichreceives, on its upper surface the lower face of the slightly beveledsuspension sleeve 23. The. .beveling of the lower surface of thesuspension sleeve 23 is clearly shown in Figure 2. The parts being thusshaped, there is always a level spot or area in contact with thesupporting washer or' ring 24. The suspension sleeve 23 isheld inposition on the shaft in any suitable manner, for example, by thethreaded It thus supports the headand shaft and takes the reaction duetothe crushing of rock or: ore in the crushing cavity.

Since very heavy thrust is received in a relativelylimited area, it isimportant that proper lubrication be maintained. In earlier crushermodels an upper bearing has been lubricated with oil, which had to bereplenishedfrequently, there being no means to contain oil in thebearing. The present invention is directed to providing an efficient andsimple sealing means to prevent the loss of lubricant. The suspensionring 24 and the oil seal retainer ring 31, in effect,'divide,theuniversal motion of the shaft 22 into a vertical sliding motion and ahorizontal sliding motion. The turning motion can divide itself equallybetween the two O-rings 36 and 38. In. practice, the oil sealer retainerring 31 is so proportioned as to fit snugly in the aperture or bore 32.Its dimension from the O-ring 3 8 in the bottom. to its smooth upperbearing.

shaft suspension sleeve, and sealing means for preventing the escape ofoil downwardly along the surface of the crusher shaft and inwardlyacross the surface of the ledge, said sealing means including an oilseal retainer ring slidably supported on the surface'of said ledge formovement in a horizontal plane generally perpendicular to the axis ofthe crusher shaft, and surrounding the outer surface of the crushershaft, said retainer ring having a circumferential channel formed in itslowersurface and another inits inner surface, and seal rings in eachsaid channel formed and adapted to be constantly compressed respectivelyagainst the upper surface of the'ledge and the outer surface of thecrusher shaft, said retainer ring being free to slide on the surface ofsaidledge.

2. The structure of claim 1 characterized in that the retainer ring hasapertures in its upper surface formed and adapted to receive a liftingtool, whereby the ring may be upwardly lifted from its seat, the channelin its lower surface being undercut, whereby to prevent the undesiredescape of the seal ring when the bottom of the retainer ring is out ofcontact with the ledge.

3. The structure of claim 1 characterized in that the suspension ring isrecessed about its lower inner edge snugly to receive the retainer ring.

4. The structure of claim 1 characterized in that the suspension ring isapertured to permit the passage of lubricant therethrough and by theprovision of vents in communication with said apertures, whereby oilpumping in response to the gyration of the crusher shaft is prevented.

5. The structure of claim 1 characterized in that the retainer ring islocated adjacent the level of'the center of gyration of the crushershaft, whereby amplitude of provided with a plurality of tap holes 47 inits upper sur-- face. Thus, after the operator has removed the, partsabove the ring he can reach down into the bearing cavity with a properlyformed rod or tool and attach the rods to the ring M by means of the tapholes, and easily remove it for replacement or repair.,

In the present structure the replacement and repair from above of thespider bearing and oil seal structure is possible without completelydismanteling the'upper portion of the crusher. The suspension sleeve 23,the suspension ring 24,

and the spider bushing 28 may be upwardly removed, giving the operatoraccess to the entire against the shaft.

lateral movement of the crusher shaft at its zone of opposition to theretainer ring is reduced to a minimum.

6. In a gyratory crusher hdving a crusher shaft and head and means forgyratz'ng them, a spider for the upper end of the shaft, said spiderhaving a hub with a '.geuer'ally'vertical aperture positioned tosurround the upper end of the shaft, said aperture having a generallyhorizontal outwardly extending lower ledge, a sleeve about said shafthaving a lower face above said ledge, and sealing means between saidshaft and spider including an oil seal retainer ring slidably supportedon t/le surface of said ledge for movement in a horizontal planegenerally perpendicular to the axis of the crusher shaft, said ringhaving a circumferential channel formed iii a lower surface and a secondsuch channel formed in its inner surfacaund yielding sealing ringsremovably positioned in each of said channels and 'formed and adapted tobe consturitlycompr'e'ssed respectivelyagainst the upper surface of theledge and the outer surface of the crusher shaft, said retainer ringbeing normally free to slide on the horizontal surface of said ledge,whereby, at all times, one of said sealing rings is under compressionagainst the ledge and the other is under compression 7. The structure ofclaim 6 characterized by and including an additional ring mounted on theledge and forming with the ledge a guiding slot for the oil sealretainer ring.

8. The structure of claim 6 characterized in that the oil seal retainerring is apertured on its upper surface to receive a connection wherebyit may be upwardly removed.

9. The structure of claim 6 characterized in that the oil seal retainerring is located adjacent the level of the center of gyration of thecrusher shaft, whereby amplitude of lateral movement of the crushershaft at its zone of opposition to the retainer ring is reduced to aminimum.

5 References Cited in the file of this patent or the original patentUNITED STATES PATENTS 557,216 McCully Mar. 31, 189(1 10 2,492,006Raybould Dec. 20, 1949 2,678,837 Griefen May 18, 1954

